Construction of sectional conduits



July 7, 1931. H, A SCHNAR 1,813,771

CONSTRUCTION OF SECTIONAL CONDUITS Filed Dec. 10, 1929 Patented July 7, 1931 NETE@ STATES HARRY A. SCHNAR, OF WABASH, INDIANA CONSTRUCTION F SECTIONAL CONDUITS Application filed December 10, 1929. Serial No. 413,048.

This invention relates to improvements 1n the construction of sectional conduit such,

for instance, as sewer pipe, and it proposes a construction of the cooperating joint parts of adjacent sections such that cement grout of slush constituency may be poured into the joint without waste or leakage and ensuring a water-tight seal, particularly at the lower part of the joint.

In the ordinary laying of sewer pipe lines, it is customary in order to avoid having the cement run out of the joint, to have the grout of such thickness that there is no assurance of its forming a homogeneous seal at the bottom of the joint. Frequently, air is entrapped or the passage of the grout is otherwise blocked, so that interstices in the seal are left at the bottom of the joint which easily. escape the notice of the workmen and are diiiicult to avoid under anyv circumstances, so that moisture from the pipe leaks into the soil attracting` the roots of vegetation to the joint, which roots enter the pipe by way of said interstices and finaln ly create a stoppage of flow through the conduit.

A further object of the invention is the provision of a sewer tile, the bell end of which is provided circumferentially with definite weakened portions or knock outs, the closing material of which may be readily knocked out with a hammer at the point desired, that is, at the upper most part of the bell when the pipe section is laid, af fording an opening through which the grout may be poured.

Still another object of the invention is the provision of an adjustable dam or sealing ring adapted to be slidably arranged on the small end of a pipe section so as to be slid into contact with the bell of the adjacentsection when said sections are laid, closing the channel of said bell endwise to prevent spilling and wastage of the thin grout.

Other objects of the invention will appear as the following description of preferred and practical embodiments thereof proceeds.

In the drawings in which the same characters of'reference are used in the several figures to denote identical parts:

Figure l represents a plan View Vof two sections of sewer tiley in laid relation, one being an elbow;

Figure 2 is a section taken along the line 2--2 of Figure l;

Figure 3 is a section taken along the line 3-3 of Figure l;

Figures fl; and 5 are perspective views .of a cooperating bell and small ends of adjacent tiles;

Figure 6 is a side elevation of an attachable and adjustable dam or sealing ring in its relation to thesmall end of the tile; and

ligure 7 is a section taken along the line 7-7 of Figure 6.

Referring now in detail to the several iigures, and rst adverting to that form of the invention shown in Figures l to 5, inclusive, the bell end of the tile is designated by the reference character l, into which extends the small end 2' of the adjacent section. Tt will be noted that the bell end is preferably formed interiorly with shoulders 3 and Ll, defining zones of different diameters within said bell.

The small' end 2 of the adjacent section litsthat part of the bell lying in the Zone of less diameter, and the shoulder 3 of the bell l is the same width as the thickness of the tile so that the inner surface of the adjacent sections come flush at the joint. This prevents the formation of a ledge with the conduit constituted by said sections against which foreign matter may lodge and accumulate.

A collar 5 is formed on the side adjacent the said pipe section preferably at such distance from the small end of said section that when the sections are fitted together, said collar is just about to abut against the end of the bell at the time the end of the said.

adjacent section is about to abut against bil Cle

collar 5 will come into actual contact with the end of the bell while the end of the smaller section and the shoulder 3 are yet some slight distance apart. The gasket 7 may, in such an instance, be dispensed with and the close contact of the collar with the end of the bell and the close interiitting relation between the said adjacent section and that part of the bell of smaller diameter be relied upon to retain the mass of thin grout which is poured into the oint. rlhe shoulder 4 and the collar 5 deiine together with the inner face of the part of the bell of larger diameter and the outer face of the said adjacent section an annular channel into which the grout is to be poured and retained.

In some instances the bell may be provided with a permanently discontinuous portion forming an opening 8 shown in Figure 4 giving access of the grout to the said channel. Vhere such opening is provided, the

.tile is, of course, laid with this opening uppermost. The thin grout is then poured 1n, and on account of the tightness of the joint between the two sections, the grout may be used so thin that it will assuredly fill and seal the underneath part of the channel as well as those parts which are more accessible.

It is preferred, however, to have the fiange 9 of the bell end of the tile provided with one or more denitely weakened portions such as l0, any desired one of which may be knocked out by a sharp blow of the hammer, thereby forming the opening through which the grout may be poured into the channel. These weakened portions iay be formed by sharply scoring the clay, while the tile is in process of manufacture. The tile may then be laid without any particular care as to which side is uppermost and the approximate weakened portion mayV then be knocked out. This form of construction is particularly adapted to elbows, which must be positioned according to the nature of the work and cannot always be laid Vwith a particular side uppermost.

By the present invention, in which a plurality of knock-outs are provided, one of these will be surely uppermost, regardless of the position of the elbows and this one may be knocked out for pouring in the cement.

It may sometimes be found desirable to dispense with the integral collar 5 on account of diiiiculties which may be met in manufacturing the same. Under such circumstances, it is quite feasible to provide a separate collar, the same being adjustably carried by the said adjacent pipe section so that regardless of the length of the bell or the distance to which the small end of the adjacent section may be inserted into the bell, the adjustable collar can always be slid down the section which it surrounds, into intimate contact with the end of the bell thus providing a retaining end wall for lthe grout. Such a collar is shown in Figures 6 and 7, in which the collar is made in two semi-annular parts 1l and l2, of any suitablematerial which may be placed around the pipe and joined by any suitable means, such as the wire 13, bent around suitably disposed projections such as the nail heads 14. In actual practice, it will probably be found economical to leave the adjustable collars in place, but it may be found practical to remove them, for repeated use, after the cement 'slush has set.

While I have in the above description endeavored to disclose what I believe to be a preferred and practical embodiment of the invention, it is to be understood that the underlying purpose of the invention is to provide the sealing band l5 of cement slush bonded with the inner and outer walls of the bell and inserted section, respectively, and with the shoulder 4, particularly in that region of the bell l which lies on the underside of the pipe, where leakage generally occurs, so that the details of construction as shown are subordinate to the broader purposes of the invention.

lVhat I claim is:

l. In combination adjacent sections of sewer pipe, one section having a bell provided Witli an inner shoulder, the other section having an end portion fitting into the rst section beyond said inner shoulder and having a flange abutting the end of said bell, said shoulder and said iange defining between said sections an annular channel for receiving cement slush, said bell being provided peripherally with weakened portions, in the Zone of said channel, one of which may be broken out to give access to said channel.

2. A sewer pipe having a bell at one end, said bell being provided with weakened portions anyone of which may be knocked out to give access to the cement receiving channel formed between said bell and an adjacent pipe section.

In testimony whereof I afliX my signature.

HARRY A. SCHNAR. 

